<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>06-computed方法生成计算属性</title>
    <style>
        *{
            cursor: pointer;
            user-select: none;
        }
    </style>
    <script src="https://unpkg.com/vue@next"></script>
  </head>
  <body>
    <div id="root"></div>

    <script>
      const app = Vue.createApp({
        setup() {
            const { reactive, computed } = Vue;

            const countObj = reactive({count: 0});
            const handleClick = () => {
                countObj.count += 1;
            }

            const countAddFive = computed({
                get:() => {
                    return countObj.count + 5;
                },
                set: (param) => {
                    countObj.count = param - 5;
                }
            })

            setTimeout(() => {
                countAddFive.value = 100;
            },2000)

            return {countObj, handleClick, countAddFive}
        },

        template: `
                    <div>
                       <span @click="handleClick">{{countObj.count}} --- {{countAddFive}}</span>
                    </div>
                `,
      });

      const vm = app.mount("#root");
    </script>
  </body>
</html>
